Saw sharpener



H. LATTA April 1, 1958 v SAW SHARPENER 2 Sheets-Sheet l Filed March 27, 1956 .w m Q N mm m a L M y r r a H Y B H. LATTA SAW SHARPENER A ril 1, 1958 2 Sheets-Sheet 2 Filed March 27, 1956 Fig.4

Harry Latra INVENTOR.-

BY WM 5% United States Patent SAW SHARPENER Harry Latta, Fort William, Ontario, Canada Application March 27, 1956, Serial No. 574,128

2 Claims. (Cl. 76-40) The present invention relates to new and useful improvements in saw sharpeners for circular saws.

An important object of the invention is to provide a supporting bracket adapted for attaching to a work bench and constructing the bracket with means for holding a circular saw in a position for sharpening by a rotary power operated grinding disc also mounted on the bracket.

Another object is to provide a mounting on the bracket for rotatably supporting the saw to bring the teeth successively into sharpening position and in which the mounting is adjustable to accommodate saws of various diameter.

A further object is to provide a swingable arm on the bracket on which the grinding disc and motor are mounted to swing the disc into and out of grinding position.

A still further object is to provide a device of this character of simple and practical construction, which is eflicient and reliable in operation, relatively inexpensive to manufacture and otherwise well adapted for the purpose for which the same is intended.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully here inafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a side elevational view;

Figure 2 is a top plan views;

Figure 3 is an enlarged sectional view taken on a line 3-3 of Figure 1;

Figure 4 is an enlarged sectional view taken on a line 4-4 of Figure 2;

Figure 5 is an enlarged fragmentary sectional view of the grinding disc supporting arm;

Figure 6 is a perspective view of the attaching arm of the bracket;

Figure 7 is a perspective view of the disc and motor supporting arm;

Figure 8 is a perspective view of the saw mounting arm;

Figure 9 is an enlarged perspective view of one end of the saw attaching cone; and

Figure 10 is a similar view of the opposite end thereof.

Referring now to the drawings in detail, wherein for the purpose of illustration I have disclosed a preferred embodiment of my invention, the numeral 5 designates the saw sharpening bracket generally and which comprises an attaching arm 6 secured at one end on top of a work bench or other suitable support 7. Arm 6 projects outwardly beyond the work bench and is formed at its outer end with a longitudinal slot 8 to receive a bolt and wing nut 9 for attaching the upper horizontal end portion 10 of an inverted L-shaped saw supporting arm 11 thereto for adjustment inwardly or outwardly on arm 6.

The vertical end portion 12 of arm 11 is formed with a vertical slot 13 to receive a bolt 14 on which a conical knurled nut 15 is threaded to enter the tapered end 16 thereof in the opening 17 of a circular saw 18 to secure the saw in an edgewise vertical position for rotation on bolt 14. A spring washer 19 is positioned on bolt 14 between the head 20 thereof and the saw to frictionally hold the saw against idle rotation. The rear end of nut 15 is formed with a square wrench engaging head 21.

The inner end of arm 6 is formed with an upstanding internally threaded boss 22 to receive a post 23 having screw threads 24 thereon and on which is threaded a knurled nut 25 having asleeve 26 rising therefrom.

A motor supporting arm 27 is formed at its rear end with a collar 28 which is swingably mounted on sleeve 26 and an electric motor 29 of an electric drill gun type is secured on top of arm 27 by a clamp 30 and which is slidably adjustable on said arm.

The outer end of arm 27 is formed with an upstanding flange 31 having a bushing 32 therein and in which a shaft 33 is journaled. The motor 29 includes a chuck 34 for attaching the rear end of the shaft thereto and a beveled grinding disc 35 is secured to the front end of the shaft.

In the operation of the device, the circular saw 18 to be sharpened is attached to the inverted L-shaped arm 11 by the bolt 14 and the conical nut 15. The tapered end 16 of nut 15 is provided to fit in openings of different diameters in the saw to firmly hold the saw on the bolt from wobbling. With the motor supporting arm 27 swingably supported on post 23 and with the grinding disc 35 attached to the motor and rotatably mounted in the outer end of arm 27 thedisc may be moved into and out of sharpening position with the teeth of the saw.

The saw may be adjusted vertically by adjusting bolt 14 in the vertical slot 13 of arm 11 and the saw may also be adjusted inwardly or outwardly on arm 6 by means of the slot 8 and bolt and wing nut 9. The grinding disc and motor supporting arm 27 may also be adjusted vertically on post 23 by means of the nut 25.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A circular saw sharpener comprising in combination, an attaching bracket including an attaching arm adapted for attaching at one end in a horizontal position to a supporting structure, a saw supporting arm at the outer end of the attaching arm, means securing the saw supporting arm in inwardly and outwardly adjusted position, means securing a saw in vertically adjusted positions on the saw supporting arm, a post rising from the inner end of the attaching arm, a motor supporting arm, means supporting the last-named arm in vertically adjusted position on the post, said last-named means including a sleeve on which the motor supporting arm is swingable, a motor mounted on said last-named arm, and a grinding disc connected to the motor and movable by the motor sup- 2,828,658 v i A j 3 V a 4 named end of the attaching arm, a motor supporting arm References Cited in the file of this patent above the attaching arm, a grinding disk on the motor UNITED STATES PATENTS supportmg arm, a motor on the motor supporting arm operatively connected to said grinding disk, means hori- 299,583 Rogers et a1 June 3, 1334 zontally swingably mounting the motor supporting arm 5 352,802 Blackmel' 16, 885 on said post, which is vertically adjustable on the post to 626,451 Alden et J1me 99 correspondingly adjust the motor supporting arm, and 675,780 Lucas J1me 1901 means on said post for vertically adjusting the vertically 2,501,498 001115 Mall 21, 50

adjustable means. 2,517,873 Harrell Aug. 8, 1950 

